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Date: Thu, 1 Mar 2012 14:13:39 +0000
Subject: Re: exec
From: Arnaud Delobelle <arnodel@gmail.com>
To: Rolf Wester <rolf.wester@ilt.fraunhofer.de>
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Xref: csiph.com comp.lang.python:21092

On 1 March 2012 13:07, Rolf Wester <rolf.wester@ilt.fraunhofer.de> wrote:
> Hi,
>
> I would like to define methods using exec like this:
>
> class A:
> =C2=A0 =C2=A0def __init__(self):
> =C2=A0 =C2=A0 =C2=A0 =C2=A0cmd =3D "def sqr(self, x):\n =C2=A0 =C2=A0retu=
rn x**2\nself.sqr =3D sqr\n"
> =C2=A0 =C2=A0 =C2=A0 =C2=A0exec cmd
> a =3D A()
> print a.sqr(a, 2)
>
> This works, but I have to call sqr with a.sqr(a, 2), a.sqr(2) does not wo=
rk
> (TypeError: sqr() takes exactly 2 arguments (1 given)).

I'm curious to know your motivation for doing this.

--=20
Arnaud